K2 - Problem with KAT2 installation

[Peter Barville]

Folks

I'm hoping somebody might be able to point me in the right direction, so
thank you in advance for reading this.

My K2 is serial number 573, so you can see that that I built it many
years ago. Similarly, I built and incorporated the KAT2 Antenna Tuner
almost as many years ago. However, the KAT2 has not been used for a long
time, as I later moved on to installing the 100W PA lid.

Although the KAT 2 was working fine when I last had it in the K2 (must
be a good few year ago), when I came to replace the 100W lid with the
KAT2 (and battery) lid yesterday I discovered there is now a problem
with the KAT2.

With J8 securely and correctly mated with P4 on the K2 Control Board,
the rig will not power up properly. After an extremely brief burst of
(probably normal) sound from the speaker, the S Meter goes to full
deflection, and the rig goes silent. It is as if the rig is in Tx mode,
although there is no RF output.

I can access the KAT2 related items in the menu but, unless KAT2's J8
is disconnected from P4, the rig will not power up correctly.

I am not aware of any mishap having occurred to KAT2 whilst it resided
mounted in its lid, but stored away in a box, but wonder whether anybody
has any suggestions as to where first to look?

Many thanks.

73 Peter G3XJS


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[Don Wilhelm-4]

Peter,

Is the green wire in J8 positioned toward the top?  If not, things will
not work well.
If U8 is oriented correctly, check the other end of the cable for broken
wires and shorts.

Even so, I am a bit confused, you say you cannot power up the K2
correctly, but you can access the ATU menu.  Please elaborate, because
on the surface, those two statements seem contradictory, the ATU menu
will only display -- if the KAT2 is not connected.

You could avoid plugging U8 incorrectly by using the same technique as
the KPA100 ribbon cable - just stuff something in U8 at the pin 4
location (toothpick, wire, anything that works, you might even glue it
in).  Since you have already removed P4 pin 4 for the KPA100 you will
have U8 also keyed.

73,
Don W3FPR

Peter Barville wrote:

> Folks
>
> I'm hoping somebody might be able to point me in the right direction, so
> thank you in advance for reading this.
>
> My K2 is serial number 573, so you can see that that I built it many
> years ago. Similarly, I built and incorporated the KAT2 Antenna Tuner
> almost as many years ago. However, the KAT2 has not been used for a long
> time, as I later moved on to installing the 100W PA lid.
>
> Although the KAT 2 was working fine when I last had it in the K2 (must
> be a good few year ago), when I came to replace the 100W lid with the
> KAT2 (and battery) lid yesterday I discovered there is now a problem
> with the KAT2.
>
> With J8 securely and correctly mated with P4 on the K2 Control Board,
> the rig will not power up properly. After an extremely brief burst of
> (probably normal) sound from the speaker, the S Meter goes to full
> deflection, and the rig goes silent. It is as if the rig is in Tx mode,
> although there is no RF output.
>
> I can access the KAT2 related items in the menu but, unless KAT2's J8
> is disconnected from P4, the rig will not power up correctly.
>
> I am not aware of any mishap having occurred to KAT2 whilst it resided
> mounted in its lid, but stored away in a box, but wonder whether anybody
> has any suggestions as to where first to look?
>
> Many thanks.
>
> 73 Peter G3XJS
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>  

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